package com.atguigu.day07;

import com.atguigu.bean.WaterSensor;
import org.apache.flink.api.common.functions.MapFunction;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.api.common.typeinfo.Types;
import org.apache.flink.api.java.tuple.Tuple;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.datastream.KeyedStream;
import org.apache.flink.streaming.api.datastream.SingleOutputStreamOperator;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;
import org.apache.flink.util.OutputTag;

public class Flink05_KeyedState_ValueState {
    public static void main(String[] args) throws Exception {
        //1.获取流的执行环境
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();
        env.setParallelism(1);
        //2.从端口读取数据
        KeyedStream<WaterSensor, Tuple> keyedStream = env.socketTextStream("localhost", 9999)
                .map(new MapFunction<String, WaterSensor>() {
                    @Override
                    public WaterSensor map(String value) throws Exception {
                        String[] split = value.split(",");
                        return new WaterSensor(split[0], Long.parseLong(split[1]), Integer.parseInt(split[2]));
                    }
                })
                .keyBy("id");

        //TODO 3.检测传感器的水位线值，如果连续的两个水位线差值超过10，就输出报警。
        SingleOutputStreamOperator<String> result = keyedStream.process(new KeyedProcessFunction<Tuple, WaterSensor, String>() {

            //TODO 定义状态
            private ValueState<Integer> valueState;

            //TODO 初始化状态
            @Override
            public void open(Configuration parameters) throws Exception {
                valueState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("value-State", Types.INT,0));
            }

            @Override
            public void processElement(WaterSensor value, Context ctx, Collector<String> out) throws Exception {

//                int lastVc = valueState.value() == null ? 0 : valueState.value();

             /*   Integer lastVc=null;
                if (valueState.value()==null){
                    lastVc = 0;
                }else {
                    lastVc = valueState.value();
                }*/

                //判断当前水位和上一次水位的差值是否超过10
//                if (Math.abs(value.getVc() - lastVc) > 10) {
                if (Math.abs(value.getVc() - valueState.value()) > 10) {
                    out.collect("警报！！！水位差超过10");
                }

                //把当前水位更新到状态中
                valueState.update(value.getVc());
            }
        });

        result.print();

        env.execute();
    }
}
